Process and machine for making window bags



Jan. 11, 1938. Q W, POPPE PROCESS AND MACHINE FCR MAKING WINDOW BAGS 4Sheets-Sheet 1 Filed Aug, 6, 1936 INVENTOR 650,?55 W PoP/2E ATTORNEY`Jari.v 11, G, W. pOppE PROCESS AND MACHINE FOR MAKING WINDOW BAGS FiledAug. e, 1955 4 Sheets-Sheet 2 1l||l||l l I I I Il I I I l I I l IlllvIIIlIIL A .mm rl INVENTOR GEO/2 CFEv M/ ,Do/@Pf .Il III Jan. 11, 1933.G. W, POPPE l 2,104,814

PROCESS AND MACHINE FOR MAKING WINDOW BAGS Filed Aug. 6, 1936Sheets-Sheet 5 Jan. l1, 1938. G. w. POPPE PROCESS AND MACHINE FOR MAKINGWINDOW BAGS Filed Aug. 6, 1956 4 Sheets-Sheet 4 INVENTOR ATTORNEYPatente 9a. il, lg

George Poppe, Brooklyn, N. Y.,

Go. Inc., B

Equitable Paper fr. r.

neas

a corporation of New York Application Ast 6,

8 Claims.

This invention relates to so-called Window bags.

that is to say, bags i`n which an opening is made in one wall thereofwhich opening is usually covered by some transparent material by whichthe contents of the bag is visible. An object of the invention is theimprovement of methods and machinery for cutting the windowd. opening inbags of this characterrin a manner which lends itself to highproduction.

It has been proposed heretofore to cut the window opening by means of asingle die. It is diiiicult in practice to make cuts with a single diein 'a continuously advancing web with precision and rapidity. v

A feature of the present invention, therefore y relates to a, method ofcutting a window bag opening whereby a plurality of dies are used. eachdie dening an outline substantially one-half of the portion to beeliminated from a wall in the finished bag, to form a window therein.

A further feature of the invention resides in a machine in which thewindow opening may be' made in either bag. Wall by the use of a plu-`rality of dies each die cutting out substantially one-half of theportion to be eliminated from a bag wall to form the window therein.

The invention will be better understood, by reference to the followingdescription when taken in connection with the accompanying drawings inwhich:

Figure l is a generally longitudinal sectional view of a bag machine ofconventional type illustrating one form of my invention.

Figure 2 is a plan view ofthe rear or right hand portion of the machineshown in Flgurel.

Figure 3 is a part elevation and part sectional view on the line 3-3 ofFigure 1.

Figure 4 is a diagrammatic View showing the development of a bag tubewith the window opening in the upper or seam wall thereof.

Figure 5'is a finished bag.

Figure 6 is a similar view to Figure 1 showing a modified form of theinvention wherein the window opening is made in the under or plain wallof the bag tube.

Figure 7 is a portion of the right hand or rear portion of the machineshown in Figure 6.

Figure '8 is a part section and part elevational view on the line 8- 8of Figure 6.

Figure 9 is a diagrammatic view showing the development of the bag tubewith the opening in the under or plain wall thereof.

Figure 10 is a finished bag made according to the process and machineillustrated in Figures 6 to 8 inclusive.

1936, serai No. 94,580

`(ci. :aa-m

Figure 11 is the reverse side of the bag shown in Figure and Figure 12shows the form of the chip or portion which is cut out of the bag wall.

Referring to Figure l the general framework of the machine is indicatedat A2 and on this framework a shaft supports a roll of paper 5 fromwhich is dravim a web 6 from which the bags axre made. This web isguided by a roller 8 and a second roller 9 to a roller I0 of hardenedsteel. At this point one edge of the web receives a line of pasteindicated at l2, Figure 4, the paste being supplied by a paste roller i3dipping into a paste pot M as is usual invmachines of this generalcharacter.

The type of bag produced, may be an ordinary `fiat notion bag. a bellowsbag, or an envelope flap bag such asv is shown and described in my'Reissue Patent 19,921 granted April 7, 1936. For the purpose ofillustration the machine shown, is designed to make the latter type ofbag and since this bag is provided with a closing ap, the mechanismshown and described in said reissue. patent is employed herein forproducing such nap. To this end a shaft I6 corresponding to the shaft52,

' Figure 1 of said reissue patent, carries a pair of knives I8 shownalso in dotted lines in Figure 2v herein, which make the diagonal cutsiri the web as said web passesover the roller iii, see Figure `4.''I'l1e mechanism concerned `with the present invention is designed toact on the web after it has passed the roller I0 but before describingthis mechanism in detail, it may be stated that the Webpasses under aformer 22 and is folded over the former to form a 'bag tube, the tubeand web being drawn through the machine by means of feed rollers 2Bmounted on upper and lower feed roller shafts 25. 'Iheweb is thensubjected to the cutting action of serrated edge knives one of whichconstitutes the edge. of theA former andis shown at 26 and the other iscarried bya lip knife shown at 28. Just prior to severance however, thetube is subjected to the acv'tion of pinch bars 3,0 whichmomentarily-retard the web while at the same time a striker bar 32carried by a sprocket chain 33 gives the tube a sharp blow from beneaththereby severing the tube into an individual bag section. The severedbag section then passes to the bottoming mechanism which includes thetucker bar cylinder 34 carrying a tucker bar 35 and a paste bar 36. Thebottom of the bag is tucked into a clamp indicated generally by thecharacter 38 carried by the clamp cylinder 39. The paste bar ,36cooperates with a paste-applying roller 40 receiv- 2 aioaeie ing pastefrom a paste pot'ili. The nished bag passes between the rollers d2 and43 which fold the bottom and deliver the bag to any form. of deliverymechanism. The pinch bars are driven one revolution for each bag. Thelower pinch bar shaft receives motion from some prime mover and from itthe other parts of the machine derive their motion.

A sprocket carried by the lower pinch bar shaft transmits motion to asprocket chain 44 whence motion is transmitted to the shaft 46 carryinga suitable sprocket about which the sprocket chain passes.

The mechanism above described is the usual type of mechanism found inbag machines, some of the special features of which are shown anddescribed in said reissue patent.

In order to make a window opening in the finished bag, the web 6 afterpassing the roller Il) passes under an idler roller 48 which is mountedon a shaft 49.' The web then passes over a hardened roller 50, Figure 3,and during its passage thereover is subjected to the action of thewindow forming dies 52. Each die 52 is carried by a block 53 on a shaft54. Each of these dies is so positioned as to cut notches in the edgesof the advancing web equal to substantially onehalf of the outline ofthe completed window opening. The form of opening shown in Figure 4 isthat of an oval, each die however, cuts a notch which is slightly morethan one-half of the oval so that when the web is folded as indicated inFigure 4, the upper or seam wall of the tube in its overlapped conditionwill meet in such a way that a completely symmetrical opening isproduced in the bag'tube. 'Ihe left hand portion of Figure 4 shows a bagsection after it -has been severed from the tube and ready to be formedinto a nished vbag shown in Figure 5.

'Ihe roller 48 is spaced slightly from that edge of the web having thepaste line I 2, otherwise paste would be smeared on the roller.

The cut-out portion or chip formed on each side of the web is disposedofv by means of a pair of cylinders 56 adjustably mounted on a shaft 58,

said cylinders being in alignment with the blocks 53, Each cylindercarries a tucker blade 59 which is operated in such timed relationthat'the movement of the web with the chip is engaged by the tuckerblade and forced into a clamp 60 in the cylinder 62 mounted on the shaft63, Figure 1. The clamp 60 is operated in a manner similar to the clamp38 by well known cam mechanism not shown, but the timing is such thatthe clamp releases the chip as the,clamp on the cylinder 63 reaches aVposition such` that the chip may conveniently fall upon a deflectingplate 64 which guides the chip towards the bottom of the machine whereit may fall upon the oor or be received into a basket or other suitablereceptacle.

The shafts I6, 54, 58 and 63 are driven in such relation to the pinchbar shafts that said shafts make one rotation for each bag madev by themachine. For driving the shafts a gear 66 is carried by the shaft 46which gear engages a similar gear 68 on a shaft 69, the latter shaftcarrying a sprocket 1l). The shafts I6, 54 and 58 also carry sprocketsabout which a sprocket chain 'I2 passes for driving all of these shaftsin the proper direction and in the same ratio. A roller 14 adjustj ablysupported in a bracket 16 provides means for taking up slack in thesprocket chain 12.

By providing a pair of dies operating as described, the web is cut ateach edge, the cuts properly joining to form a symmetrical opening whenthe web is folded.

By the method and machine described, the

window opening is formed in the seam wall of the finished bag. In theform of the invention, shown in Figures 6 to 1l inclusive, however, thewindow opening is formed in that portion of the web which constitutesthe under-side of the bag tube as it passes through the machine andconstitutes the plain wall of the nished bag. The same referencecharacters are used to designate like parts in these figures as are usedin the rst described form.

As in the first described form of the invention, the web of paper 6 isdrawn from the roll 5 and passes under the guide' roller 9 and over thehardened steel roller I8 where it receives the diagonal cuts for formingthe sides of the closing flap of the bag. The web also is folded in theway previously described by passing under the former 22 being drawnalong by the feed rollers 2st and being subjected to the action of thestriker bar 32 which separates individual bag sections from the main bagtube. The pinch bar mechanism and the mechanism for bottoming the bagare the same as previously described.

In the present form of the invention, however, the window opening is inthe plain wall of the finished-bag and`consequently the cuts to formthis opening must be so located in the web as it passes through themachine that they will be on the under wall of the tube after the web isfolded. In the present form, therefore, the web is subjected to theaction of two dies mounted on il separate shafts, the shafts beingindicated as 8U and 82, Figures 1 and 2. The die cylinders 83 and 84 arelocated centrally of the web width and are each longitudinallyadjustable on their respective shafts in order to properly position themfor webs of different widths. Each die cylinder carries a die 86 whichin the form shown is a little larger than half of the portion to be cutfrom the web to form the window opening in the finished bag. 'Ihe endsof each die make a cut which will be slightly overlapped by the cut madeby the succeeding die. The outline of these cuts is indicated in Figure9 and the overlapping feature is best shownY in Figure l2. It is to beparticularly noted, however, that the overlapping cuts do not show inthe window opening because they are produced in the chip which isdiscarded. The mechanism for disposing of the chip is similar to thatshown in the first described form and lncludes the tucker cylinder 56carried by the shaft 58 and having a tucker blade 59 which tucks thechip into the clamp 60 carried by the clamp cylinder 62. There is,however, only one tucker blade cylinder 56 and one clamp cylinder 62 inthe present form and these are located substantially central of the web.

with a sprocket chain 12 as previously described.

What I claim is: A

1. The method of making a window bag which consists in making cuts in aweb of paper each cut defining an outlineysubstantially one-half of theportion to be eliminated from the bag wall in the nished bag to form awindow therein, folding the web to forma bag tube, severing the tubeinto bag sections and bottoming successive sections with the cut-outportions intermediate the ends of a bag section.

2. The method of making a window bag which consists in making cuts inthe side edges of a web of paper, each cut defining an outline ofsubstantially one-half of the portion to be eliminated from one wall ofthe iinished bag to form a window therein, folding the web to form a bagtube severing the tube into bag sections with the cut-out portionsintermediate the ends of a bag section, and subsequently completing thebag' in known manner. 1

3. 'Ihe method of making a window bag which consists in removing aportion of paper from each edge of a web of paper thereby leaving gapsin the web. each gap being substantially equal to one-half of the windowopening in'the wall of the ilnished bag, folding the web so that theedges slightly overlap and the gaps form a com- 'plete window opening ina tube, severing the portions intermediate the endsvof a bag section,and subsequently finishing the bag by known means v .-5. The method ofmaking a window bag which consists in making cuts in a web of paperwithin the side edges thereof, each out defining substantially one-halfof the portion to be eliminated from one bag wall to form a windowtherein, folding the web to form a bag tube with the cut-out portions inone wall thereof, severing the bag tube'to form bag sections andbottoming each tube section.

6. In a machine for making window bags, the combination with mechanismfor making a bag tube from a web of paper; oftmeans for cutting aportion from each side edge of the web prior to folding the same into atube, the cuts being so located as to form a window opening in the bagtube wall when the web is folded, means for severing the tube into bagsections with the cutout portions intermediate the-ends of a bag sectionand means for bottoming each section to form a bag.

7. In a machine for making window bags, the combination with mechanismfor making a bag tube from a web of paper; of dies for cutting the weblocated within the side edges\of the web, each die having the shape andsize to define substantially one-half'of the window opening.

8. In a machine for making window bags, the

have their ends'overlapped, -each die having the shape and size todefine substantially one-half of thewindow opening.

GEORGE W. POPPE.

